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Subgroups of infinite index in Fuchsian groups. (English) Zbl 0223.20054

MSC:
20H10 Fuchsian groups and their generalizations (group-theoretic aspects)
20E06 Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations
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References:
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[4] Magnus, W., Karrass, A., Solitar, D.: Combinatorial group theory: Presentations of groups. Pure and Appl. Math., vol.13. New York: Interscience 1966. · Zbl 0138.25604
[5] McCool, J.: Elements of finite order in free product sixth-groups. Glasgow Math. J.9, Part 2, 128-145 (1968). · Zbl 0197.01902 · doi:10.1017/S0017089500000410
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